Hash Tag 해시태그 is a seven-member female idol group under Luk Factory. The group is produced by Kan Miyoun. They debuted on October 11, 2017, with their 1st mini-album The girl next door.

Member Dajeong competed in "Produce 101" as a trainee of Hello Music Entertainment. She was eliminated in episode 5 at rank 62.

On September 8, former Baby V.O.X. member Kan Miyoun confirmed that she would produce a 7-member group named Hash Tag. Starting September 18, for 8 consecutive days, individual and group teaser photos were released. On October 11, the music video for "ㅇㅇ(Hue)" was released alongside the debut mini-album The girl next door. The group started their promotions for their album through a showcase on October 10, then made their broadcast debut on October 13 through "Music Bank."

Trivia

Sojin and Aeji were both born in 1999, in the Year of the Hare. They’re the same height, 163 cm or 5'4" tall.

Dajeong and SuA were both born in 1995, in the Year of the Pig.

Sojin and Subin were both born in September but in different years. They’re both Libras. Their birthdays are 6 days apart.

The tallest member, Subin (172 cm or 5'7½"), is taller than the shortest member, Seungmin (162 cm or 5'4"), by 10 cm.